Hurricane Isaac is north of Houma, Louisiana and moving to the northwest, according to the noon advisory from the National Hurricane Center.

Isaac, with winds at 75 mph, is moving at 6 mph, and that general motion is expected to continue, according to the NHC. Forecasters say a turn to the north-northwest is expected tonight or Friday. That would take the storm through Louisiana and onto Arkansas by Friday.

According to the NHC advisory, National Ocean Service tide gages indicate that storm surge heights of 6 to 8 feet are still occurring along portions of the coast of southeastern Louisiana and Mississippi.

A hurricane warning remains in effect from east of Morgan City, Louisiana, to the Mississippi-Alabama border. A hurricane watch is in effect for Intracoastal City to Morgan City, Louisiana.

A tropical storm warning is in effect from east of the Mississippi-Alabama border to the Alabama-Florida border, and from Morgan City to Sabine Pass, Texas.

A tropical storm watch is in effect from east of High Island, Texas, to just west of Sabine Pass.